摘要
采用高压反应釜对内蒙古褐煤(IML)进行了不同温度的水热处理,并利用电子顺磁共振(EPR)波谱仪考察了水热处理对褐煤热解焦油中自由基的影响.结果表明,经过水热处理后,煤热解焦油中自由基的含量明显降低,在处理温度为260℃时达到最小值,自由基含量降低了66.67%;随着处理温度的升高,焦油的g因子值不断减小,峰宽增加,但在300℃时峰宽低于原煤焦油的峰宽.结合气相色谱质谱联用仪(GC-MS)对焦油的组分进行了测定,结果显示,经过水热处理后,焦油中酚类物质减少,单环芳烃的质量分数由15.10%上升至18.24%,多环芳烃的质量分数由12.79%上升至13.95%.通过在一定的保存时间内(40d)持续对焦油中自由基含量的分析,发现经过水热处理后的热解焦油中,自由基的含量在保存过程中增加的趋势较原煤焦油缓慢,并且更早趋于稳定.
Inner Mongolia lignite was treated at different temperatures in an autoclave. The effect of hydrothermal treatment on free radical in lignite tar was investigated by EPR （electron paramagnetic resonance） spectrometer. The results show that the content of free radical in tar decreases obviously after hydrothermal treatment and reach minimum at 260 ℃ （decrease 66.67%）. With the increase of hydrothermal treatment temperature, the g factor value of EPR spectra of tar is decreased and the linewidth of that is increased. However, the linewidth of EPR spectra of treated lignite tar at 300 ℃ is lower than that of raw coal tar. Combined with gas chromatography and mass spectrometry （GC-MS） for the determination of tar components, it shows that the relative content （mass fraction） of phenols decreases while monocyclic aromatic hydrocarbons in tar increase from 15. 10%to 18. 24%, polycyclic aromatic hydrocarbons in tar increase from 12. 79%to 13. 95%. Moreover, the free radical in tar was analyzed by EPR continuously within a certain time （40 d）. The results show that the content of free radical in tar after hydrothermal treatment increases more slowly and reaches stably earlier than that in the raw tar in the preservation process.
出处
《煤炭转化》
CAS
CSCD
北大核心
2017年第1期26-31,共6页
Coal Conversion
基金
国家重点基础研究发展计划(973)项目(2011CB201304)
关键词
电子顺磁共振
自由基
水热处理
褐煤
焦油
稳定性
electron paramagnetic resonance, free radical, hydrothermal treatment, lignite, tar, stability
